Carburetor



Sept. 1, 1931. A. GIRIN l 1,821,909

GARBURETOR Filed Dec. 11, 192:5 3 sheets-sheet 1 J3 FIGA. l Flc-9.2.

l Sept. l, 1931. A, GIRlN 1,821,909

CARBURETOR Filed Dec. 1'1, 1925 s sheets-snaai 2 ygfm@ www fawn,

Sept. 1, 1931. I A G1R|N 1,821,909

CARBURETOR Filed Deo. 11, 1923 3 Sheets-Sheet 3 6 1 6 le 1'), 10 m1 3 In1/ Jbl l 21 1/ z E c O o 3 o g n 6 7k h a Z1 j, e] 6 7 o la 5 which isin communication withthe well 1 through ducts 15 (Figure 4). Y

It has been previously stated that the air may flow through the passagesand 11 because under 'the action of suction, the emulsion air enteringthrough the openings j and then into the chamber 12 and from therethrough the small opening 13 into the bore 14 of piston 'h and thenthrough passage 15 and well 1 commingles in this well with the fuel. andforms an emulsion which in the ,form of gaseous bubbles rises throughthe passages 2 11 and 10 in the direction towards the mem- -sure mustprevail.

Consequently the air contained in the well 1 has a tendency to escape inthe form ofsmall exhaust bubbles to'rise in the passage 11 and to arrivein the passage 10 where there is a partial vacuum. The piston k isconical for part of its length h1, thereby gradually blocking'thetpassage h3 (Figure 1).

The member m is connected with the well 11 through the horizontalpassage 8 and through the inclined passage 9 which terminates at thebase of the well 11. The member m is therefore connected with the lowespart of the well 11. The upper part of this well communicates throughthe canal 18 and through a vertical' groove in the wall of the f part71, with the tube 14. This tube is in communication with the atmosphere4through small openings 13 located at the lower portion of the part hand terminating in the chamber 12, the wall of which has several smallholes jl in direct communication with the atmosphere.

The passage 8 draws the `fuel Ifrom thewell 11 to the. nozzle m, andsince the passage 10 .is at the same level as the assage 8, the inclinedpassa 11 will be lled with` fuel as well as the lower part of thewell 1. This is due to the law of communicating tubes.

The purpose of the annular space h and the internal collar whichseparates it from the annular space k7 is to allow the pressure in theair passages which unite at m (Figure 3) to be varied. This air whichmay come directly from the outside or from a sourceof air tobe heatedvariably and connected with the adjustingdevice o, Figure 5, flows downin the vertical passage 19. Then through the horizontal passage 20,Figure 4,.it arrives in the chamber k", Figure 1. It traverses theconical port k3, and this additiohal air is introduced through thehorizontal passages 21, Figure 1, and 22 Figure 2, and vertical passage23, Fi re 4, to flow into the passage 01 closed y the stoppler 03,Figure 5, and finally landing in the c amber or nozzle element m. Aportion ofthe air entering through o is directly admitted to the nozzlem.

The upper face of the sleeve h1 acts as a piston with res ct to the baseh* of the tube h5 in which t e piston h operates. The.

movement of the piston varying the volume of fthe chamber h andfthe airwhich is present therein being compressed and forced upthe vertical duct16 (Fi re 4) ducts 17 .igures 3 and 4) and 184 igures 1 and 4) into/thewell 11 `arranged 1n the passage of the' mixture giving additional airfor startin the engine. l

e passages 1&9; 20 serve to place the chamber L3 in communication wlththe `atmospheric air, through canal 19. This passage starts from bushingo and the passage 20 lterminates at 21 in the annularspace ha.

In this way atmospheric pressure is caused to prevail in the said space.

The valve n is carried by the rod' n. This rod is connected with the barn' which is pivotally member is fixed to the shaft g1.

The chamber h is a closed chamber into which the air cannot enter at j.The volume of the piston L reduces the volume of this chamber h andtherefore compresses the air in this chamber. This air therefore isforced from said chamber through the vertical lateral passage 1 (Figure4). The air flows from this passage through the passages 17, 18 totheupper. portion of the well 11 made in the passage of the fuel with whichit comfastened to the member g and this municates by a recess. Themovement of the piston therefore induces the inflow of the fuelcontained in the well 11 and brings this fuel to the Well 1. In thereturn stroke of l the piston the air forced into the well 11 vreturnsinto the chamber h. h

The addition of air to the mixture will now be described. Air heated bythe engine exhaust or otherwise, enters by the ipe o and is drawnthrough the nozzle m y the suction'of the engine mixing with the mixtureentering the nozzle m through the ports m. This mixture `then enters ahollow chamber n communicating by passages n1 with the chamber 'n1 ofthe induction pipe 'nof the engine, mixing with air drawn into themixing chamber n* by the engine and an air-fuel mixture having acomposition of optimum quality enters thecylinders of the engine throughthe induction pipe n. The inlet of the main air is regulated by thevalve n, which uncovers to a greater or less extent the opening n. Thisplug valve is aixed to the member g by a connecting rod n1 and a pistonrod n.

The action of the carburetor when working under normal pressure is asfollows:

through ports y'.

claim f 1. The `main air enters through n controlled b v the valve n.

2. Heated air enters through o and passes throu h the nozzle m.

3. ir for aerating the fuel enters the ports 4. Further .airAcmpres'sedbv the piston. h1 for starting enters through ports j.

These admissions of air are controlled by the rotation of the spindle g.When this latter has rotated in ythe direction of the arrows shown onFig. 1, the piston a* has risen, increasing the flow of fuel;y thepiston h has risen at the same time increasing the flow of air and thepiston as descended increasing the flow of main air. These differentmovements-caused by the rotation of the'spindle g3 are controlledby theaccelerator pedal connected to this latter. At the time of deceleratingthe inlet of fuel is diminished at the same time as that of the air. Thepiston k1 by its rapid descent causes a slight fall of pressure on thecarburant which balances the inertiaV of this latter and prevents theenrichment of the mixture at the moment when the engine is .being slowedup. The use of the piston h1 is thus to render the engine more sensitiveto the accelerator pedal.

At the end of the stroke of the piston a the valve a completely/shutsolf the fuel inlet avoiding loss during stopping or during long descentsif the engine is not running.

rIhe strokeof the pistons and the air inlets are controlled to give thebest `mixture for each position of the accelerator.

Adjustments are made from time to time by moving the fulcrum of thelever c, a

movement controlled through the cam 'd3 and arm d by the spindle d*ailixed to the control lever to slightly modify the proportion of ffnelto air.v This .proportion varies with temperature, compression,-heightand thecom osition of the fuel.

aving thus described my invention, `I

1. A carburetor including ay fuel inlet, a needle valve to control saidinlet, a piston, a

with ports which register with such air ports,

said ast named piston being active to force aerating air through thefuelin said well and means actuated by said controlling elementl toactuate said hollow piston.

Inwitness whereof I aix my signature.

. ANTOINE GIRIN.A

cylinder in'which said piston operates, a

sleeve carried by said piston and ,in which sa1d needle valve isarranged, a sprmg in said sleeve bearing on said needle valve,V a

control shaft, a lever operated by the control shaft and having a oatingfulcrum, a rod connecting said lever to` said piston, and means to varythe position of the floating fulcrum to thereby vary the stroke of thepiston. 4

2. A carburetor including a fuel inlet, a needle valve to control saidinlet, a piston, a cylinder in which said piston operates, a sleevecarried by said. piston and ini'which said needle valve is arranged, aspring bearing on said needle valve, a controlling element, a leveroperated by the controlling element and having a ioating4 fulcrum, a rod

